SHEET OUT OF HIGH VISCOUS ALUMINIUM-COPPER-LITHIUM ALLOY FOR FUSELAGE OF AIRCRAFT Russian patent published in 2011 - IPC C22C21/12 C22F1/57 

FIELD: metallurgy.

SUBSTANCE: alloy on base of aluminium contains from 2.1 to 2.8 wt % of Cu, from 1.1 to 1.7 wt % of Li, from 0.1 to 0.8 wt % of Ag, from 0.2 to 0.6 wt % of Mg, from 0.2 to 0.6 wt % of Mn; amount of Fe and Si of each is less or equal to 0.1 wt % and unavoidable impurities in contents less or equal to 0.05 wt % each and 0.15 wt % in total. Contents of zirconium is less, than 0.04 wt %. The procedure for fabrication of the above said aluminium alloy consists in casting a plate, in homogenisation of the said plate at temperature from 480 to 520°C during from 5 to 60 hours, in hot, and, and, if necessary, cold rolling the said plate into a sheet at initial temperature of rolling from 450 to 490°C. Further, the said sheet is placed into solution at temperature from 480 to 520°C during from 15 minutes to 4 hours, and quenched, and drawn under control with residual deformation from 1 to 5%. The sheet is tempered by heating at temperature from 140 to 170°C during from 5 to 80 hours.

EFFECT: production of alloy with high mechanical strength, ductility, corrosion resistance, low density and lacking anisotropy.

12 cl, 5 dwg, 7 tbl, 1 ex